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In most cases, you cannot wallpaper over existing wallpaper. It’s possible to wallpaper over non-coated wallpaper, but vinyl-coated wallpaper is much more prevalent in homes, so you generally shouldn’t put new wallpaper over existing wallpaper. Adding a layer of wallpaper over vinyl-coated paper will lead to poor adhesion, leaving behind bubbles and imperfections in your wall. Plus, wallpapering over vinyl-coated wallpaper can lead to mold growth, which can be hazardous to your health. It’s usually best to hire a local wallpaper removal service to handle the task to avoid these issues.

Your peel-and-stick wallpaper can fall off for multiple reasons, including high humidity levels, extreme temperature changes, poor installation, and even the wall surface. Textured walls can prevent the adhesive from fully sticking to the wall, making it more likely for the wallpaper to peel off. Low-quality wallpapers with weaker adhesives are also more likely to fall off prematurely.

Walls should be as smooth as possible before applying peel-and-stick wallpaper. Although you technically can apply wallpaper on textured walls, the peel-and-stick variety won’t last long without a clean, smooth surface for the adhesive to stick to. If you have textured walls, consult a pro about removing the textured finish before moving forward with wallpaper.

The two most common reasons wallpaper does not stick are a lack of preparation and improper adhesive. Be sure to use the wallpaper paste designed for the type of paper you choose. Before beginning your project, make sure the walls are clean and free of dust, grease, and oils.